Description
System Overview
You take a modular hardware platform and you couple it with an optimized system firmware. Then you select the latest MEMS sensors and equip a dual-core ARM Cortex microcontroller. Add Bluetooth communication, a USB-C interface and a 1Gb FLASH memory. Finally, you program it with sensor fusion and other embedded AI software. That’s how you get Muse: a low power, miniaturized, wireless multi-sensor logger.
Our customers have used Muse as wireless IMU, motion tracker, sport sensor, vibration sensor, magnetic sensor, impact sensor, temperature sensor, humidity sensor, Bluetooth beacon, black box logger, smart alarm, and every day we keep enjoying its versatility.
The secret is in its name. Muse stands for multi-sensor which means the system is ideal for a variety of wearable and IoT applications that require a reliable, state-of-the-art and certified product platform.
Details Comparison
Inertial Configuration
Accelerometer
Gyroscope
Magnetometer
HDR Accelerometer
Temperature
Humidity
Barometer
Microphone
Time of Flight
Ambient & Infrared Light
Full Configuration
Accelerometer
Gyroscope
Magnetometer
HDR Accelerometer
Temperature
Humidity
Barometer
Microphone
Time of Flight
Ambient & Infrared Light
What’s Included
In its FULL configuration, the system features: 1x tri-axis accelerometer , 1x tri-axis gyroscope, 1x tri-axis magnetometer , 1x High Dynamic Range tri-axis accelerometer , 1x temperature sensor , 1x relative humidity sensor , 1x high resolution barometer , 1x microphone and 1x ambient light & distance time of flight sensor .
The INERTIAL configuration includes: 1x tri-axis accelerometer, 1x tri-axis gyroscope, 1x tri-axis magnetometer.
The system is highly miniaturized in a 22x22x5.85 mm PCB form factor. It includes a 110 mAh rechargeable lithium-ion battery (alternatively it can be powered directly by the 5V USB-C plug or the expansion port). Data logging memory is provided by a 1Gb NAND Flash memory. MUSE includes a push button for ON/OFF operations or programmable functions (e.g. start/stop logging), visual interaction RGB LEDs and an acoustic interaction buzzer.
The optional housing is a 3d printed PA enclosure ensuring mechanical protection of the system. 3D CAD files are available if you wish to customize your own enclosure.
Sensors
Accelerometer
Measurement range ±4 / ±8 / ±16 / ±32 g
Sensitivity 0.122 / 0.244 / 0.488 / 0.976 mg/LSB
ODR max 1600 Hz
Gyroscope
Measurement range ±250 / ±500 / ±1000 /±2000 dps
Sensitivity 8.75 / 17.50 / 35 / 70 mdps/LSB
ODR max 1600 Hz
Magnetometer
Measurement range ±4 / ±8 / ±12 / ±16 Gauss
Sensitivity 0.15 / 0.3 / 0.43 / 0.58 mGauss/LSB
ODR max 1000 Hz
HDR Accelerometer
Measurement range ±100 / ±200 / ±400 g
Sensitivity 49 / 98 / 195 mg/LSB
ODR max 1000 Hz
Temperature
Measurement range -40 °C ~ +125 °C
Accuracy ±0.2 °C
ODR fixed 25 Hz
Relative Humidity
Measurement range 0 ~ 100% rH
Accuracy ±1.8% rH
ODR fixed 25 Hz
Barometer
Measurement range 260 ~1260 hPa
Sensitivity ±1 hPa
ODR fixed 25 Hz
Microphone
Acoustic overload 122.5 dBSPL
Sensitivity -26 dBFS
Time of Flight
Measurement range up to 10 cm
Ambient & Infrared Light
Measurement range 2.2 mlx ~ 73 klx
Sensitivity 1.1 lx/LSB
System Specification
Microcontroller
Core 1 Arm® Cortex®-M4F
Core 2 Arm® Cortex®-M0+
Frequency Up to 64 MHz
Communication Interface
Wired USB 2.0, type C connector
Wireless Bluetooth Low Energy v5.2
Data Storage
Data Memory 1 Gbit
Memory Type NAND Flash
Battery
Capacity 110 mAh
Dimension
Board 22 W x 22 L x 5.85 H mm
Housing 33 W x 28 L x 16.27 H mm
Datasheet
Click here to explore a comprehensive technical breakdown of the Muse Miniaturized Multisensor.
Quickstart
Access instructions and guidelines for proper use of the Muse Miniaturized Multisensor system.
Download
Download and gain access to 221e’s proprietary software, the Muse Viewer and useful documents.
Frequently Asked Questions
How can I control the system and what tools are included?
You can control it via Bluetooth or the provided Windows app. A one-button log mode is available after initial setup. C# (Windows) and C++ (Windows & Unix) SDKs are included for integration.
How long will it take to download my saved files?
That depends on how big the file is, and how it is downloaded. We suggest using USB for better performances; the entire memory can be downloaded in roughly 15 minutes if using USB, or around 4 hours if using BLE.
What format and units are used in the data logs?
Timestamps follow the Unix epoch format. Accelerometer data is in milligravity [mg], gyroscope data in degrees per second [dps], and magnetometer data in milligauss [mG].
Do I need to calibrate the sensors before use?
No. All sensors are factory-calibrated. However, the magnetometer should be recalibrated whenever you change the physical location or acquisition setup, unlike the accelerometer and gyroscope which generally don’t need frequent recalibration.
Can I log or stream inertial and environmental data at the same time?
Yes. Please note that environmental data is sampled at a fixed 25 Hz rate, meaning that if, for example, a 1600 Hz log is selected, the file will contain a lot of repeated environmental data values due to their up-sampling.
Can I log and stream data at the same time?
No, log and stream are two different modes of the device, which is capable of handling them one at a time.
How can I save power when I’m not using the system?
The system, if not connected via Bluetooth, will automatically enter standby after 30 seconds of inactivity. You can force the standby mode by pressing the button for a duration between 2 and 5 seconds. The system can be removed from the standby mode with the same button press
How long does the system battery last and how can I recharge it?
The 110 mAh Li-ion battery provides about 25–26 hours in logging mode, 32–33 hours in streaming mode, and over 1 year in standby. Actual battery life depends on sampling rates (up to 1600 Hz) and active sensors; for very long logging sessions, memory capacity is usually the main limitation. You can recharge the system by connecting it via a standard USB-C cable. A full charge takes around 2 hours.
What is the duration of the memory? For how long can I save data?
The internal memory dedicated to data is 1Gbit. The duration depends on the frequency of data sampling and the number of sensors sampled; a rough estimate of the memory duration can be computed using the following equation:
Where D is the memory duration in hours, Fs is the selected sampling frequency and Ns is the number of sensors logged. Keep in mind that for very low sampling frequencies, it is likely that the battery will run out before the memory
What affects sample rate and Bluetooth range?
Sample rate depends on your device’s BLE performance, other connected Bluetooth devices, the number of Muse units streaming, and the data per unit. Bluetooth range can reach 30 m in ideal conditions, but drops with obstacles or interference.
What happens if the system runs out of memory or battery during a log?
If the system runs out of memory during a log, the log will be automatically terminated and the file will be available for download up to the point of interruption. If the system runs out of battery during a log, when the system is recharged, it will attempt to recover the last file: if the recovery is successful, the file will be available for download up to the point of interruption.
Will my device keep its settings after being powered off or the battery runs out?
Yes. Your configuration is stored in non-volatile memory and remains unchanged until you apply a new one, so there’s no need to resend commands every time you power on or connect the device.
Can I customize the system firmware to my needs?
At the time, no. A structure to enable a degree of customization of the firmware is in the works.
